#include "stdio.h"
int main()
{
int year,month;
for(;;)
{
printf("请输入一个年份:");
scanf("%d",&year);
printf("请输入一个月份:");
scanf("%d",&month);
if(year=0) break;
switch(month)
{
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:printf("该月为31天\n");break;
case 4:
case 6:
case 9:
case 11:printf("该月为30天\n");break;
case 2:if((year%4==0)&&(year%100!=0)||(year%400==0))
printf("该月为29天\n");
else
printf("该月为28天\n");break;
}
}
return 0;
}